Use the quadratic formula to solve the equation. If the equation has no real number solution, so state.x2 + 7x + 3 = 0
A. x = 
B. x = 
C. x = 
D. x = 
Answer: D
Mathematics
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Solve the problem.The lifespan for a pair of walking shoes is normally distributed with a mean of 
steps and standard deviation of 
steps. If a manufacture produces 6000 pairs of these shoes, how many can be expected to last for at least 732,800 steps?
A. ? 1391 pairs B. ? 1313 pairs C. ? 1205 pairs D. ? 1271 pairs
Mathematics
Graph the quadratic function.f(x) = -2x2 + 8x
A. 
B. 
C. 
D. 
Mathematics
Rationalize the denominator. Assume that all variables represent positive real numbers.
A. 
B. 
C. 
D. 
Mathematics
Choose the correct response.What is the speed of a plane that travels at a rate of 568 mph with a wind of r mph?
A. (r - 568) mph
B. (568) + r mph
C. 
mph
D. (568) - r mph
Mathematics